<template>
  <div class="box" style="height: 500px">
      <div class="xtx-slider" @mouseenter="mouseenterFn" @mouseleave="mouseleaveFn">
          <!-- 图片列表 -->
          <ul class="slider-body">
              <li
              class="slider-item"
              :class="{ fade: curIndex === i }"
              v-for="(item, i) in sliders" :key="i">
                  <img :src="item.imgUrl" alt="">
              </li>
          </ul>
          <!-- 圆圈切换按钮 -->
          <div class="slider-indicator">
              <span
              @click="curIndex = index"
              :class="{ active: curIndex === index }"
              v-for="(item, index) in sliders" :key="index"></span>
          </div>
      </div>

  </div>
</template>

<script>
import { ref, onMounted } from 'vue'
export default {
  name: 'XtxBanner',
  props: {
    sliders: {
      type: Array,
      default: () => {
        return []
      }
    },
    autoPlay: {
      type: Boolean,
      default: false
    }
  },
  setup (props) {
    const curIndex = ref(0)

    const timer = ref(null)

    function mouseenterFn () {
      clearInterval(timer.value)
    }

    function mouseleaveFn () {
      autoPlay()
    }

    function autoPlay () {
      if (!props.autoPlay) {
        clearInterval(timer.value)
      } else {
        timer.value = setInterval(() => {
          curIndex.value++
          if (curIndex.value > props.sliders.length - 1) {
            curIndex.value = 0
          }
        }, 2000)
      }
    }

    onMounted(() => {
      autoPlay()
    })

    return { curIndex, mouseenterFn, mouseleaveFn }
  }
}
</script>

<style scoped lang="less">
 .xtx-slider {
  width: 100%;
  height: 100%;
  min-width: 300px;
  min-height: 150px;
  position: relative;
  .slider {
    &-body {
      width: 100%;
      height: 100%;
    }
    &-item {
      width: 100%;
      height: 100%;
      position: absolute;
      left: 0;
      top: 0;
      opacity: 0;
      transition: opacity 0.5s linear;
      &.fade {
        opacity: 1;
        z-index: 1;
      }
      img {
        width: 100%;
        height: 100%;
      }
    }
    &-indicator {
      position: absolute;
      left: 0;
      bottom: 20px;
      z-index: 2;
      width: 100%;
      text-align: center;
      span {
        display: inline-block;
        width: 12px;
        height: 12px;
        background: rgba(0, 0, 0, 0.2);
        border-radius: 50%;
        cursor: pointer;
        ~ span {
          margin-left: 12px;
        }
        &.active {
          background: #fff;
        }
      }
    }
    &-btn {
      width: 44px;
      height: 44px;
      background: rgba(0, 0, 0, 0.2);
      color: #fff;
      border-radius: 50%;
      position: absolute;
      top: 228px;
      z-index: 2;
      text-align: center;
      line-height: 44px;
      opacity: 0;
      transition: all 0.5s;
      &.prev {
        left: 20px;
      }
      &.next {
        right: 20px;
      }
    }
  }
  &:hover {
    .slider-btn {
      opacity: 1;
    }
  }
}
</style>
